[Q] Sideload Fix Update

Hey all, a friend just picked up a used Captivate. It had 2.1 on it when he got it so we got KIES and installed the Froyo update. He still isn't able to sideload however. I heard that AT&T pushed out an update to allow sideloading in May. We tried checking for firmware updates but nothing is showing up??? Is there a way to manually install this update on a non-rooted device? Why can't I find ANYTHING on the interwebs relating to this subject. Does everyone have root at this point or something????

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